Yes it's a clear epi.
This is a simple cross of Stupice X Black Cherry. Both the pink and the black are very sweet and tasty.. I'm not sure what happened with the pink last generation as a friend of ours grew them out but haven't heard back from her. I know the huge clusters were carried on, which seem to be a trait in the black as well.
Will have to see if the earliness comes back next generation. These plants were really badly affected by transplanting and putting them under LED lights. The earliness was closer to Stupice in other generations. (which was the point of the cross - as you said.